So for sure im getting a i7 4790K however. it only has 16 PCI-e lanes? it said on the intel ARK web site that it can use 2x8 PCI-E. so im wondering. can i use my R9 270xs in crossfire with it? or will it only use one GPU. or is there a way to make a 16x PCI-E into a 8x PCI-E? i know that 8x is just enough for a R9 270x. so. can i have it? or will i have to sell my other GPU and maybe save up for a R9 295x2 ive been looking at?
Yes you can xfire no problem
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really? thats good. but how would it work? ( i mean would it down grade the 16x to a 8x so its 8x and 8x or?)
right now my mobo is 16x and 4x and my other gpu is being bottlenecked by it. (im using a Athlon x4 860K)
yes it will automatically run at x8 x8
awesome! yes! i7 4790K here i come (RIP AMD :( maybe if your new zen cpus have aweome single thread preformance with your awesome prices ill go back but for now farewell my friend)
Your GPUs are still pretty good and keeping up with NVidia :)
AMD allows Crossfire to run as low as x4, so if you really wanted to you could run 4 GPUs in Crossfire on just 16 lanes. nVidia doesn't allow SLI to register below x8 however, so you would still be stuck to 2-way SLI.
(As if there is much point to using more than 2 cards for gaming anyway.)
8x pcie lane speed has more than enough bandwidth for any current gpu on the market. I run my oc'd 980 in a 8x slot (so my rig is nicer to look at) and there is zero difference in performance to that of a 16x lane.
Here is an old article worth reading
- http://www.techpowerup.com/reviews/NVIDIA/GTX_980_PCI-Express_Scaling/
Well my PC's cross fire config sucks... m first card is in 16x@16x and my second is at 16x@1x :/ thats why i need that new mobo and cpu lol
You are reading what the bandwidth is reported at idle. Use GPU-Z's little built in detector tool that puts enough load through both cards to read the active bandwidth on both lanes. It will probably change to either x8-x4 or x8-x8.
Well right now im using and Athlon x4 860K i dont know how many PCI E slots it has. does AMD have a "ARK" like site like intel?
Normally your motherboard should tell you what each slot runs at. One of them should be at least PCIe 2.0 x4.
What motherboard are you using?
GA-F2A88XM-D3H is my mobo
That means that your bottom card should be running at PCIe 2.0 x4. Not optimal, but not the end of the world.